*{
    margin:0;
    padding:0;
    box-sizing: border-box;
}
.clearfix::before,
.clearfix::after{
    content:"";
    display: block;
    height:0;
    line-height: 0px;
    clear:both;
    visibility: hidden;
}
// 先整体再局部
header{
    height:50/50rem;
    background-color:#ff841d;
    .left{
        float: left;
        a{
            display: block;
            margin-left:17/50rem;
            margin-top:12/50rem;
            img{
                display: block;
                width:185/50rem;
                height:25/50rem;
            }
        }
    }
    .right{
        float: right;
        a{
            display: block;
            margin-top:7/50rem;
            margin-right:7/50rem;
            img{
                display: block;
                width:34/50rem;
                height:34/50rem;
            }
        }
    }
}